Results 31 to 40 of about 5,159 (225)

Gas phase polymerization of ethylene with a silica-supported metallocene catalyst: influence of temperature on deactivation [PDF]

, 1997
Ethylene was polymerized at 5 bar in a stirred powder bed reactor with silica supported rac-Me2Si[Ind]2ZrCl2/methylaluminoxane (MAO) at temperatures between 40°C and 80°C using NaCl as support bed and triethylaluminium (TEA) as a scavenger for impurities.
Meier, G.B., Roos, P., Samson, J.J.C., Samson, Job Jan C., Weickert, G., Westerterp, K.R.   +5 more
core   +2 more sources

Chemical and Physical State of Catalysts in the Growth of Single-Walled Carbon Nanotubes inside Metallocene-Filled Single-Walled Carbon Nanotubes

Materials Proceedings, 2023
In this study, the state of catalysts is revealed during the growth of single-walled carbon nanotubes (SWCNTs) inside metallocene-filled SWCNTs. High-resolution transmission electron microscopy and Raman spectroscopy were used to study the kinetics of ...
Marianna V. Kharlamova
doaj   +1 more source

Hybrid materials based on polyethylene and MCM-41 microparticles functionalized with silanes: catalytic aspects of in situ polymerization, crystalline features and mechanical properties [PDF]

, 2016
New nanocomposites based on polyethylene have been prepared by in situ polymerization of ethylene in presence of mesoporous MCM-41. The polymerization reactions were performed using a zirconocene catalyst either under homogenous conditions or supported
A. Bento, Alexander, Alonso-Moreno, Arranz-Andrés, Arranz-Andrés, Arranz-Andrés, Beck, Bento, Boyd, Bunn, Campos, Campos, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Cerrada, Chen, Chen, Chenite, Darras, Diez-Pascual, dos Santos, E. Pérez, Finch, Fonseca, Fox, Gedde, Ha, Heijboer, Hiltner, J.P. Lourenço, Jafari, Jentys, Jezequel, Kageyama, Kageyama, Kubacka, Kubacka, Lin, Lourenco, Lu, López-Majada, M.L. Cerrada, M.R. Ribeiro, Marcilla, McCrum, Millot, Oliver, Palza, Palza, Popli, Popli, Prieto, Quinn, Schatzki, Shin, Shirayam, Sindorf, Sinfrônio, V. Lorenzo, Vincent, Ward, Wunderlich, Wunderlich, Ye, Zapata, Zhao   +70 more
core   +1 more source

Interplay of reversible chain transfer and comonomer incorporation reactions in coordination copolymerization of ethylene/1–hexene [PDF]

Polyolefins Journal, 2019
Coordinative chain transfer polymerization (CCTP) has opened a new path for the development of novel products like olefin block copolymers and chain-end functional polyolefins.
Ali Ebrahimi, Saeid Ahmadjo, Mohsen Mohammadi, Mohammad-Mahdi Mortazavi, Mostafa Ahmadi   +4 more
doaj   +1 more source

An Integrated AHP-PROMETHEE Method for Selecting the most Suitable Ethylene Propylene Diene Termonomer [PDF]

Journal of Petroleum Science and Technology, 2016
This paper considers the problem of selecting the most appropriate ethylene propylene diene monomer (EPDM), which is a polyolefin with a variety of usages in different areas.
Ali Sibevei, Zahra Naji Azimi, Saied Ahmadjo, Mohammad Mahdi Mortazavi   +3 more
doaj   +1 more source

UHMWPE/SBA-15 nanocomposites synthesized by in situ polymerization [PDF]

, 2016
Different nanocomposites have been attained by in situ polymerization based on ultra-high molecular weight polyethylene (UHMWPE) and mesoporous SBA-15, this silica being used for immobilization of the FI catalyst bis [N-(3-tert-butylsalicylidene)-2,3,4,
Adewole, Amoli, Ana E. Ferreira, Baier, Bakshi, Beck, Beloshenko, Bento, Bryliakov, Campos, Campos, Campos, Carlini, Cerrada, Cerrada, Chen, Cui, Cybo, Dangsheng, Deng, Dong, Dorigato, Díez-Pascual, Ernesto Pérez, Guo, Henri Cramail, Ianuzzi, Ivanchev, Ivanchev, Iwashita, João P. Lourenço, Kaminsky, Katti, Klimova, Kresge, Kurek, Kurtz, M. Rosário Ribeiro, Makio, Makio, Maria L. Cerrada, Mitani, Oliver, Olmos, Panchenko, Park, Quinn, Ribeiro, Sandaroos, Severn, Sinfrônio, Spiegelberg, Sánchez, Talebi, Tjong, Vicente Lorenzo, Wypych, Xu, Zhang, Zhao, Zohuri   +60 more
core   +3 more sources

Selective ethylene trimerization by titanium complexes bearing phenoxy-imine ligands: NMR and EPR Spectroscopic studies of the reaction intermediates [PDF]

, 2014
The catalyst systems (FI)TiCl₃/MAO (FI = phenoxyimine ligand with an additional aryl–O–CH₃ donor) display exceptionally high activity in selective ethylene trimerization.
Bryliakov, Konstantin P., Ma, Jing, Redshaw, Carl, Semikolenova, Nina V., Soshnikov, Igor E., Talsi, Evgenii P., Zakharov, Vladimir A., Zhao, Ke Qing, Zhao, Ke-Qing   +8 more
core   +2 more sources

Olefin Polymerizations Oriented by Rational Designs of Group-13 Compounds. [PDF]

Chem Rec
In coordination olefin polymerization chemistry, boron and aluminum compounds play important roles in both catalyst components and monomers. This personal account introduces our recent progress on the development of catalyst systems featured by the design of group‐13 counteranions, as well as the application of boronic acid‐crosslinked polyolefins to ...
Tanaka R, Zou Y.
europepmc   +2 more sources

Zirconium and titanium complexes supported by tridentate LX2 ligands having two phenolates linked to furan, thiophene, and pyridine donors: precatalysts for propylene polymerization and oligomerization [PDF]

, 2008
Zirconium and titanium complexes with tridentate bis(phenolate)-donor (donor = pyridine, furan and thiophene) ligands have been prepared and investigated for applications in propylene polymerization.
Agapie, Theodor, Bercaw, John E., DiPasquale, Antonio G., Henling, Lawrence M., Rheingold, Arnold L.   +4 more
core   +2 more sources

Analysis of the Continuous Feeding of Catalyst Particles during the Growth of Vertically Aligned Carbon Nanotubes by Aerosol-Assisted CCVD

Nanomaterials, 2022
Aerosol-assisted catalytic chemical vapor deposition (AACCVD) is a powerful one-step process to produce vertically aligned carbon nanotubes (VACNTs), characterized by the continuous supply of the catalyst precursor (metallocene). The behavior of catalyst
Celia Castro, Rodrigo Fernández-Pacheco, Mathieu Pinault, Odile Stephan, Cécile Reynaud, Martine Mayne-L’Hermite   +5 more
doaj   +1 more source